Rumble is a good ap tank!I try a lot of builds and guides but sometimes in 5v5 team we got no tank so I improvised a build for my own and for help my team!Well as you can see i put no ap items just rylai's (Some people will disagree with that and with all expensive items but i will explain my thoughts later!) that's because rumble does a lot of damage w/o any ap item on him!(eg i got matches with [10 2 10]. [ 8 1 13] etc )So don't worry that much for ap!Rumble Needs a lot of Hp and regeneration because at start game he suffer a lot of damage from ap and mostly ad!

Well as you can See I choose teleport and ignite!The reasons are:

a)Teleport:

I need teleport for smaller xp,creeps losses
and for pushing and assisting my teamates.It will be a great help both start and late game.Also with tp u can do a lot of combos!eg
1.)u can place a ward to enemy nexus(somewhere safe) and tp to it.
2.)u can tp to heimer turrets,shaco's minions,Jarvan's flag etc
3.)Finaly u can take as a team two tp's and push together or assist


b)Ignite:

I need ignite for first blood and for others obvious reasons such as healing reduction!
Ignite fits Perfect to rumble because he can use these 3 combo for a hero who is trying to escape
1.)open the shield increase his speed
2.)first spell slow the target
3.)ignite for avoiding to get into the turret
And dead w/o damage to u!

Well mostly i got problem with ad so I make armor Items except warmog's i make that anyway!Omen is for the team and for higher regeneration(force of nature)!ThornMail will be a great help for the damage u deal So is a great thought for Rumble!If u got enemies ap team u should forget about thorn and make a Lich bane instead or a Spirit Visage!I hate guardian angel but it helps a lot in other heroes.Also zhonyan's it's a waste of g to Rumble active its not usefull for Rumble!

I hope u try my build and enjoy as well xD!In The next page i Got an ap rumble not as good as tanky one anyway Gl Hv!